Add prefix feature

src/editor_op.c

@@ -13,6 +13,10 @@ void editorInsertChar(int c) {
 }
 
 void editorInsertNewLine() {
+  /*
+   * Add new line and place the cursor at the beginning of it
+   */
+  fprintf(stderr, "Inserting new line\n");
   erow *row;
   if (!E.cursor_x) {
     editorInsertRow(E.cursor_y, "", 0);
@@ -27,6 +31,7 @@ void editorInsertNewLine() {
   }
   ++E.cursor_y;
   E.cursor_x = 0;
+  fprintf(stderr, "Insert new line done\n");
 }
 
 void editorDelChar() {